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    Porous polytetrafluoroethylene molded article
    1.
    发明授权
    Porous polytetrafluoroethylene molded article 失效
    多孔聚四氟乙烯成型品

    公开(公告)号：US6080472A

    公开(公告)日：2000-06-27

    申请号：US103722

    申请日：1998-06-24

    申请人： James Huang ,  William Chou ,  David Chou ,  Jenn-Yuh Kau ,  Yui-Whei Cheng-Yang ,  Woh-Jer Lee

    发明人： James Huang ,  William Chou ,  David Chou ,  Jenn-Yuh Kau ,  Yui-Whei Cheng-Yang ,  Woh-Jer Lee

    IPC分类号： B29C55/00 ,  C08J5/18 ,  B32B3/00

    CPC分类号： C08J5/18 ,  B29C55/005 ,  B29K2027/18 ,  B29K2105/04 ,  C08J2327/00 ,  Y10S428/903 ,  Y10S428/91 ,  Y10T428/249978 ,  Y10T428/24999 ,  Y10T428/249992

    摘要： To provide a porous polytetrafluoroethylene sheet which has excellent cold flow resistance and is used suitably for gaskets and a highly densified polytetrafluoroethylene sheet which has high tensile strength and flex life and is used suitably for diaphragms. The porous polytetrafluoroethylene sheet is produced from a polytetrafluoroethylene material having a microstructure of nodes interconnected by fibrils and has MTS of from 3,000 to 12,000 psi and C.I. of 0.02 to 0.20 g/cc/psi. The highly densified polytetrafluoroethylene sheet is produced by compression-molding the porous polytetrafluoroethylene sheet and then sintering completely. The porous polytetrafluoroethylene sheet is also laminated with a sheet of other material to provide a composite polytetrafluoroethylene molded article.

    摘要翻译： 为了提供耐冷流动性优异的多孔聚四氟乙烯片材，适用于垫片和高度致密化的聚四氟乙烯片材，其具有高拉伸强度和挠曲寿命，并适用于隔膜。 多孔聚四氟乙烯片材由具有通过原纤维互连的节点的微结构的聚四氟乙烯材料制成，并且具有3,000至12,000psi的MTS和C.I. 为0.02〜0.20g / cc / psi。 高密度聚四氟乙烯片材是通过压缩多孔聚四氟乙烯片材然后完全烧结制成的。 多孔聚四氟乙烯片也与其他材料片层压，以提供复合聚四氟乙烯模塑制品。

    Production method of a polytetrafluoroethylene sheet or film
    2.
    发明授权
    Production method of a polytetrafluoroethylene sheet or film 有权
    聚四氟乙烯片或薄膜的制造方法

    公开(公告)号：US06702971B2

    公开(公告)日：2004-03-09

    申请号：US09985385

    申请日：2001-11-02

    申请人： James Huang ,  William Chou ,  David Chou ,  Shia-Chung Chen ,  Woh-Jer Lee ,  Lei-Ti Huang ,  Ching-Yao Huang

    发明人： James Huang ,  William Chou ,  David Chou ,  Shia-Chung Chen ,  Woh-Jer Lee ,  Lei-Ti Huang ,  Ching-Yao Huang

    IPC分类号： B29C4712

    CPC分类号： B29C55/005 ,  B29C47/0004 ,  B29C47/0021 ,  B29C47/124 ,  B29C55/18 ,  B29K2027/18 ,  B29K2105/0058 ,  B29K2105/256 ,  B29L2007/005 ,  B29L2031/265

    摘要： To provide a method of producing a uniaxially stretched polytetrafluoroethylene gasket tape, which comprises: (1) a step for preparing a paste comprising a mixture of a polytetrafluoroethylene powder obtained by emulsion polymerization and an extrusion aid, (2) a step for extruding the paste by means of an extruder equipped with a die which has plural separators inside an orifice thereof having a rectangular cross section, (3) a step for rolling, in the extruding direction, an extrudate having slit lines to give a rolled polytetrafluoroethylene sheet, (4) a step for uniaxially stretching the rolled sheet in the rolling direction after removing the extrusion aid from the rolled sheet, and (5) a step for heat-treating the obtained uniaxially stretched polytetrafluoroethylene sheet. The die of the extruder has plural sheet-like separators in the orifice thereof having a rectangular cross section. The separators are mounted so that free ends thereof are located at a point exceeding a center point of a long side of the orifice, and function to provide slit lines inside the extrudate in parallel with the long side of the orifice. The high performance inexpensive PTFE gasket tape is produced by the uniaxially stretching method and has properties equal to those of biaxially stretched PTFE gasket tape.

    摘要翻译： 提供一种单轴拉伸聚四氟乙烯垫片带的制造方法，其特征在于，包括：（1）制备包含通过乳液聚合获得的聚四氟乙烯粉末与挤出助剂的混合物的糊料的步骤，（2）挤出糊料的步骤 （3）在挤出方向上轧制具有切割线的挤出物以得到轧制的聚四氟乙烯片材的步骤（4），（4）在具有矩形横截面的孔中具有多个分离器的模具， ）从轧制板除去挤出助剂后，在轧制方向上单轴拉伸轧制板的工序，（5）对所得单轴拉伸聚四氟乙烯片进行热处理的工序。 挤出机的模具在其孔中具有多个片状隔离物，其截面为矩形。 分离器被安装成使得其自由端位于超过孔的长边的中心点的点上，并且用于在挤出物内部与孔的长边平行地提供切割线。 高性能廉价的PTFE垫片带通过单向拉伸法制造，具有与双轴拉伸PTFE垫片带的性能相同的性能。

    Process for forming an expanded porous tetrafluoroethylene polymer
    3.
    发明授权
    Process for forming an expanded porous tetrafluoroethylene polymer 失效
    形成膨体多孔四氟乙烯聚合物的方法

    公开(公告)号：US5098625A

    公开(公告)日：1992-03-24

    申请号：US628322

    申请日：1990-12-17

    申请人： James Huang ,  William Chou ,  David Chou

    发明人： James Huang ,  William Chou ,  David Chou

    IPC分类号： B29C47/00 ,  B29C47/54 ,  B29C55/00 ,  B29C55/06 ,  B29C55/18 ,  B29C67/24

    CPC分类号： B29C55/18 ,  B29C47/0004 ,  B29C47/54 ,  B29C55/06 ,  B29C67/24 ,  B29C47/00 ,  B29C47/0021 ,  B29C55/00 ,  B29K2027/18 ,  B29K2105/04 ,  Y10S425/055

    摘要： A process for preparing an improved expanded porous polytetrafluorethylene product having a higher density and improved cold flow properties and prepared from a paste formed from a polytetrafluoroethylene resin and a lubricant. The method includes extruding the paste through an extrusion die at a reduction ratio of less than 100, calendering the extrudate, removing the lubricant, and heating the extrudate to a temperature greater than the crystalline melting point of polytetrafluoroethylene but generally below the temperature at which thermal decomposition becomes appreciable while concurrently expanding the extrudate to at least twice its original length.

    摘要翻译： 一种制备改进的膨胀多孔聚四氟乙烯产品的方法，其具有更高的密度和更好的冷流动性能，并且由由聚四氟乙烯树脂和润滑剂形成的糊料制备。 该方法包括以小于100的压缩比将挤压模挤出挤出模具，压延挤出物，除去润滑剂，并将挤出物加热至高于聚四氟乙烯的结晶熔点的温度，但通常低于热 分解变得明显，同时将挤出物膨胀至其原始长度的至少两倍。

    Turbine blades and methods of manufacturing
    7.
    发明授权
    Turbine blades and methods of manufacturing 有权
    涡轮叶片及制造方法

    公开(公告)号：US08206108B2

    公开(公告)日：2012-06-26

    申请号：US11953489

    申请日：2007-12-10

    申请人： Ardeshir Riahi ,  Kin Poon ,  David Chou ,  Malak F. Malak

    发明人： Ardeshir Riahi ,  Kin Poon ,  David Chou ,  Malak F. Malak

    IPC分类号： F01D5/18

    CPC分类号： F01D5/147 ,  F01D5/18 ,  F01D5/20 ,  F05D2230/10 ,  F05D2230/211 ,  F05D2240/307 ,  Y02T50/676

    摘要： A turbine blade includes a convex suction side wall, a concave pressure side wall, a tip wall, an internal cooling circuit, and a plurality of tip edge channels. The tip wall is recessed from a first tip edge of the suction side wall and a second tip edge of the concave pressure side wall to define a suction side wall tip section and a pressure side wall tip section, and the suction side wall tip section is shorter than the pressure side wall tip section. The internal cooling circuit is formed at least partially between the convex suction side wall, the concave pressure side wall, and the tip wall. The plurality of tip edge channels formed through the first tip edge of the convex suction side wall extend to the internal cooling circuit. Methods of manufacturing turbine blades are also provided.

    摘要翻译： 涡轮叶片包括凸吸入侧壁，凹压侧壁，尖端壁，内部冷却回路和多个尖端边缘通道。 顶壁从吸力侧壁的第一顶端边缘和凹压侧壁的第二顶端边缘凹入，以限定吸入侧壁顶端部分和压力侧壁顶端部分，并且吸力侧壁顶端部分是 比压力侧壁末端部分短。 内部冷却回路至少部分形成在凸吸入侧壁，凹压侧壁与顶壁之间。 通过凸形吸入侧壁的第一顶端边缘形成的多个尖端边缘通道延伸到内部冷却回路。 还提供制造涡轮叶片的方法。

    Equalization for DMT and OFDM communication systems
    8.
    发明授权
    Equalization for DMT and OFDM communication systems 有权
    DMT和OFDM通信系统的均衡

    公开(公告)号：US07433398B2

    公开(公告)日：2008-10-07

    申请号：US10889530

    申请日：2004-07-12

    申请人： Fa-Long Luo ,  David Chou

    发明人： Fa-Long Luo ,  David Chou

    IPC分类号： H03K5/159

    CPC分类号： H04L25/03012 ,  H04L25/03159 ,  H04L2025/03414 ,  H04L2025/03445 ,  H04L2025/03522

    摘要： The invention provides a DMT or OFDM equalization system that deals with each tone not only separately, but also globally, which provides better overall performance. In the inventive system, only M+T variables are required to be determined, where M is the number of tones and T represents the number of SIRF taps. The invention defines a matrix R, in which optimal coefficients are found as the eigenvector corresponding to the smallest eigenvalue of the matrix R. The dynamic range of all variables is limited in a system in accordance with the present invention, which provides ease of hardware implementation. Furthermore, the inventive system retains the advantages of per-tone equalization by providing a smoother signal-to-noise ratio (SNR) distribution function versus synchronization delay. In addition, no effort is wasted on the equalization of unused tones, because it is unnecessary to determine the coefficients for unused tones.

    摘要翻译： 本发明提供了一种DMT或OFDM均衡系统，其不仅分别地，而且全局地处理每个音调，这提供了更好的整体性能。 在本发明的系统中，仅需要确定M + T个变量，其中M是音调的数量，T表示SIRF抽头的数量。 本发明定义了矩阵R，其中找到最佳系数作为与矩阵R的最小特征值对应的特征向量。所有变量的动态范围在根据本发明的系统中受到限制，这提供了硬件实现的容易性 。 此外，本发明的系统通过相对于同步延迟提供更平滑的信噪比（SNR）分布函数来保留每个音调均衡的优点。 此外，由于不需要确定未使用音调的系数，因此不会浪费对未使用音调的均衡。